describe('practice-3-7', function () {

    it("获取高次幂的尾数", function () {
        var mantissa = high_order_digit_mantissa(13,13,3);
        console.info('mantissa:'+mantissa);
        var value = Math.pow(13,13);
        var str_value = value.toString();
        var last_number = str_value.substr(str_value.length-3,3);
        expect(parseInt(last_number,0)).toBe(mantissa);

    });

});